No
Bias is independent as to front/rear connections. 

I use my headset w/bias (CM500) on rear and my Heil HM12 dynamic mic on from 
without bias in front jack. 

Sent from my iPhone
...nr4c. bill


> On Mar 15, 2018, at 9:33 PM, Bob Harvey - K2PI <gadgetl...@gmail.com> wrote:
> 
> When using a rear panel headset requiring Bias, what is the state of Bias on
> the Front Panel mic connector?  
> 
> I have a PR-781 Microphone that doesn't require bias, and have it
> disconnected from the front panel when using the rear bias'd mic and the RP
> bias setting in the menu.  Do I need to do this?
> 
> 73
> Harv
> K2PI
> 
> 
> 
> 
> --
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